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提出了一种在变换域中抑制窄带干扰(NBJ:Narrowband Jamming)的方法。该方法首先对所接收的直接序列扩频(DSSS:Direct Sequence Spread Spectrum)信号进行小波包变换(WPT:Wavelet Packet Transform),然后利用DSSS信号的功率谱密度(PSD:Power Spectrum Density)分布特点和能量聚集度(ECM:Energy Compaction Measure)准则,有效、快速地跟踪输入信号频谱的变化,从而对DSSS信号中的干扰进行快速定位。对强、弱NBJ的分别抑制是通过自适应改变权系数的方法来实现的。多径莱斯(Ricean)衰落信道中的仿真结果表明,这种变换域中的自适应干扰抑制法既可以有效地清除快速时变的强NBJ,又可在处理其它类型干扰时,避免或减小有用信息的损失,从而大大提高DSSS系统在复杂干扰情况下的抗干扰性能。
A method of suppressing Narrowband Jamming (NBJ) in transform domain is proposed. The method first performs Wavelet Packet Transform (WPT) on the received DSSS (Direct Sequence Spread Spectrum) signal and then uses the PSD (Power Spectrum Density) distribution of the DSSS signal and Energy Compaction Measure (ECM) guidelines to quickly and efficiently track changes in the input signal spectrum to quickly locate interference in DSSS signals. The suppression of strong and weak NBJs is achieved by adaptively changing the weight coefficients. The simulation results in the multi-path Ricean fading channel show that the adaptive interference suppression method in this transform domain can not only effectively eliminate the fast time-varying strong NBJ but also avoid or reduce the interference of other types of interference Small loss of useful information, thereby greatly improving the anti-jamming performance of the DSSS system under complex interference conditions.